Calling non-final function sound in constructor

kotlin继承的时候，在init里面调用一个被复写的方法sound，在生成子类对象调用父类的init方法时，不会调用父类的sound,而是调用子类的sound,这是因为：调用init方法的是子类对象，所以sound也是子类方法先，即使init里面是this.sound,当前对象是子类，就是调用子类的sound

open class Animal(color: String, age: Int) {open fun sound(color: String, age: Int) {println("Color is $color")println("Age is $age")}init {sound(color, age)}
}class Dog(color: String, age: Int) : Animal(color, age) {override fun sound(color:String,age:Int){println("Dog,color :$color,age:$age make sounds woof")}
}fun main(args: Array<String>) {var d = Dog("white", 12)d.sound("Black",11)
}

输出为：

Dog,color :white,age:12 make sounds woof
Dog,color :Black,age:11 make sounds woof

去掉子类复写的方法则符合预期

open class Animal(color: String, age: Int) {open fun sound(color: String, age: Int) {println("Color is $color")println("Age is $age")}init {sound(color, age)}
}class Dog(color: String, age: Int) : Animal(color, age) {
//    override fun sound(color:String,age:Int){
//        println("Dog,color :$color,age:$age make sounds woof")
//    }
}fun main(args: Array<String>) {var d = Dog("white", 12)d.sound("Black",11)
}

输出为：

Color is white
Age is 12
Color is Black
Age is 11

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